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[FEAT(extract_stems)]: tidy up bass guitar extraction from demucs #319

Description

@drumscript-admin

testing issue forms, for a real issue

Summary

It's not clear how to access the bass only stem from current syntax

# (IN PROG) TEST EXTRACT BASS
# results = ds.extract_stems(AUDIO_FILE_11, verbose=True)

# Extract all stems
stem_result = ds.extract_stems(
    AUDIO_FILE_11,
    all_stems=True,
    output_dir="stems",
    # full=True,  # LEGACY (v0.1.5)
    verbose=True,
)

#print(f"Bassless track: {stem_result['bass']}")

## BASS BACKING TRACK

results = ds.extract_stems(AUDIO_FILE_12, mute=["bass"], verbose=True)
print(f"Bassless track: {results['mix']}")

NOTE: the argument mute=["bass"] works, but it saves as {song_name}_no bass

results[mix] renders an error

KeyError                                  Traceback (most recent call last)
Cell In[11], [line 4](vscode-notebook-cell:?execution_count=11&line=4)
      1 ## BASS BACKING TRACK, MAN IN THE BOX
      2 
      3 results = ds.extract_stems(AUDIO_FILE_12, mute=["bass"], verbose=True)
----> [4](vscode-notebook-cell:?execution_count=11&line=4) print(f"Bassless track: {results['mix']}")
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